I have a lil hobo houseboat and want to put 4 speakers inside and 4 outside and be able to switch from one to the other or all and do this with a kenwood car stereo.The indoor/outdoor speakers that i find are all 8ohm and the speaker selectors are for home use.Can i use these selectors on dc current and should i just build some indoor/outdoor speakers with car speakers or has anyone seen 4ohm indoor/outdoor speakers. thanks for any help roy